Modeling and optimization of photovoltaic serpentine type thermal solar collector with thermal energy storage system for hot water and electricity generation for single residential building.

Abstract

Increasing surface temperature has a significant effect on the electrical performance of photovoltaic (PV) panels. A closed-loop forced circulation serpentine tube design of cooling water system was used in this study for effectively management of the surface temperature of PV panels. A real-time experiment was first carried out with a PV panel with a cooling system at heat transfer fluid (HTF) flow rates of 60kgh-1, 120kgh-1, and 180kgh-1. Based on the experimentation, a correlation for a nominal operating cell temperature (NOCT) and thermal efficiency for collector was developed for experimental validation of useful energy gained, cell temperature, and electric power generation. The developed correlations were validated with the use of electric power electrical power and useful energy gained in photovoltaic serpentine thermal solar collector (PV/STSC) and fitting into the experimental results with a deviation of 1% and 2.5% respectively. Further, with the help of developed correlations, a system was developed in the TRNSYS tool through which an optimization study was performed based on electric and hot water demand. The findings indicated an optimal system with an 8-m2 PV/STSC area, a HTF flow rate of 60kgh-1, and thermal energy storage (TES) system having a volume and height of 280l and 0.8m could meet 91% and 33% of the hot water demand for Ac loads and 78% or DC loads, respectively.